From publisher blurb:
Explore the unique world of Ellumara, a bustling city of light and magic in the midst of an invasion by aberrations from the extraplanar Black-Beyond. With the unexplained disappearance of its powerful and enigmatic founder, its citizens are left to uncover his grand design for the war, solve his mysterious legacy, and perhaps take up the city's reigns.
You'll find the following within this compendium's 57 pages:
The history and lore of Ellumara and its eccentric tyrannical founder, Elmond Brighthammer
Lumemancy, a new type of light magic that modify existing rules and spells, as well as add new spells, rules, and effects.
The Lumemancer Archetype — with a unique mechanic that allows you to swap in new subclass features to replace your current one, allowing you to take on characteristics of a light mage.
A lumemancer spell list, including rules for adding and modifying spells to add to the list.
8 radiant feats for characters who want to be radiant warriors, radiant mages, or lumenguild members.
6 light-themed spells, including a spell that conjures a radiant whip and a spell that binds enemies to areas of light.
32 radiant-themed items, from the laser-like Ruby Pointer to the repurposed tricolor Stoplyte, and even the light-swallowing artifact inhabited by an unnamable shadow aberration.
10 light-themed foes, from the mysterious hard-light glowforged constructs to the draconic glow wyrms. Also included is a template for modifying stat blocks to create the invading eldritch aberrations from the Black-Beyond.
72 exciting adventure hooks, discoveries, and encounters to kick off a game set in Ellumara.